Option C is correct.
- Proportion means two ratios are equal to each other.
<h3>Option A Option B</h3>
1 : 3 and 6 : 3 1 : 3 and 3 : 6
1 : 3 and 2 : 1 1 : 3 and 1 : 2
not proportional not proportional
<h3>Option C Option D</h3>
3 : 1 and 9 : 3 3 : 1 and 3 : 9
3 : 1 and 3 : 1 3 : 1 and 1 : 3
proportional not proportional